Maireed poses with a partly eaten roll on a trainCredit: Caters News Agency

And after snapping pictures with her favourite snack outside every one, she realised her pals found it hilarious - and even set up an Instagram page to post the evidence.

She is now on a mission to visit every single one of the chain's 1,764 bakeries.

Mairead said: “The plan now is to go to every Greggs in the country.

“My favourite from Greggs is definitely the vegan sausage roll- I love them.

"I started posting the pictures on Instagram and my friends thought it was hilarious - then strangers started commenting.

MISSION IMPOSSIBLE?

"I've been to more than 50 stores so far, but I'm planning to add a lot more to my total by visiting some big cities and going on multiple Greggs visits in one day.

“I have been a vegetarian my whole life, I have never eaten meat, my parents are vegetarian, so I was brought up like this and then chose to continue being a vegetarian. When Greggs brought out the Vegan Sausage roll I was in heaven.

“There are all sorts of places that do vegetarian junk food but for me it’s always been a novelty – my friends were getting a sausage roll when hungover and I couldn’t do that.

“I was always quite jealous because it’s so quick and easy and it’s only £1- being a vegetarian is so much more expensive, you have to find alternatives."

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She poses eating a vegan roll in Beaconsfield with her friend YazCredit: Caters News Agency

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Vegetarian Mairead started her sausage roll binge when she visited Newcastle-upon-Tyne in SeptemberCredit: Caters News Agency

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Mairead fell in love with the non-meat based treats when they were launched by the bakery chain earlier this year

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Mairead has hundreds of people commenting on the snaps of Greggs branchesCredit: Caters News Agency

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